What may make some sense is for Poser to be able to make RI calls and do a fully-compliant RIB export on its own, for no other reason than to ensure that Poser output can interface directly into the higher end renderers. It may be a good enough reason for some... "important" situations. For example, if the animator renders to 640x480 to ensure that the scene has all the needed elements (maybe sans background scenery and special effects), the director can have the animation rendered to HDTV DVD quality offline, add in the background and special effects from other programs, and the director can have some level of assurance that the animation will, in fact, render. The data given on the Final Fantasy DVD said they used at least three renders per scene - animation, background, and special effects. So, making Poser Renderman-compliant may make it acceptable for the director to just release the Poser output to, say, Exluna's Entropy rendering, before it goes to editing.